Abstract
The RC4 stream cipher has two components: KSA and PRGA. Though this simple and fast cipher has proved itself as robust and is trusted by many organizations, a number of researchers claim that RC4 has some weaknesses and bias in its internal states. Researchers point to the swap function of RC4 as the main reason for its weakness, especially in KSA. In this paper, the authors eliminate KSA and use a mathematical process to generate the initial internal state array of RC4. The original RC4 and the modified RC4 are tested with the NIST Statistical Test Suite and it is found that the modified RC4 gives better security.
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